# Endless lego set

The endless lego set contains only 6, 9, and 20-kilogram blocks that can no longer be polished or broken. The workers took them to the gym and immediately started building different buildings. And, of course, they wrote down how much the building weighed. They noticed that a 7 kg structure could not build them. Others do. Finally, they decided to find out from what least weight they already knew, using 6, 9, and 20 kilograms to build each building. What is the smallest weight of the building from which all the heavier buildings can be built?

### Correct answer:

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#### You need to know the following knowledge to solve this word math problem:

**algebra**- integer equation
- prime numbers
**arithmetic**- cube root
- division
**planimetrics**- chord
**basic functions**- reason
- minimum
**numbers**- integers
- natural numbers

#### Units of physical quantities:

#### Grade of the word problem:

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